Zoom lens system, imaging device and camera

Details Zoom lens system, imaging device and camera Zoom lens system, imaging device and camera

2007-12-18

2007-12-18

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11712506

ABSTRACT:
A zoom lens system comprising a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, wherein in zooming, the lens units move respectively along an optical axis so that an interval of first lens unit and second lens unit decreases while an interval of second lens unit and third lens unit changes with variable magnification, the first lens unit comprises one object side negative lens element and one image side positive lens element, which have an aspheric surface, and the conditions: n12>1.88, ν12<26 and 3.0<f3/fW<5.5 (ωW>30, n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit, f3is a composite focal length of the third lens unit, fWis a focal length of the entire zoom lens system at a wide-angle limit) are satisfied.

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